The Internet is Rotting. Interesting and disturbing: a lot of the modern world’s important archival material depends on the internet, where broken or removed links can easily eliminate it.:
The first study, with Kendra Albert and Larry Lessig, focused on documents meant to endure indefinitely: links within scholarly papers, as found in the Harvard Law Review; and judicial opinions of the Supreme Court. We found that 50 percent of the links embedded in Court opinions since 1996, when the first hyperlink was used, no longer worked. And 75 percent of the links in the Harvard Law Review no longer worked.
I have a poorly-articulated, poorly-implemented rule of thumb: store things online only if i could live with them all disappearing tomorrow.
(thanks to @ayjay for steering me to this.)